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    finally got my 470 merc out to the water

    rebuilt 1983 470 alpha one. i got to test run the boat in the water all went ok just a couple of things. charging system went ok(i did the conversion). the oil pressure went to 80 lbs at the beginning but then it went to 40lbs idle 60lbs WOT after it got to operating temperature. the temperature...
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    question on ways of cleaning up grudge inside of motor

    i wanted to start my own thread. i was told by adding a litre of trany fluid to your motor oil is a good way of cleaning out the grudge out of a motor. this info has came from a very reputable mechanic i know achris has commented already what do you guys think
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    older style sending unit and gauge

    1983 thundercraft 470 merc i posted previously on my fuel gauge and sending unit problem i need to ask one last question is it possible i have bought the wrong fuel sending unit meaning it reads 30 - 240 ohms would my gauge be set up for a 0 - 90 ohms sending unit. would this higher resistance...
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    1983 thundercraft 470 merc 170hp fuel gauge & sending unit question

    i bought a new sending unit because the old was no good to verify that i benched tested the old one and no reading benched tested the new one worked good. i then i tested the fuel gauge the way the manual says to do it and it worked good. so one would think everything should work but it didn't...
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    trim pump question

    reading the manual says to vent the pump before checking fluid level. looking at the picture i can see where the manual knob is and the fill screw but where is the vent screw could the vent screw and the fill screw be the same?
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    470 timing question

    I going to tackle the timing today on my 1983 470 quick question the manual says 4 degrees BTDC but i converted to electronic ign. does the degrees stay the same for elec. ign.?
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    outdrive question

    Ok just to refresh everybodies memory 1983 I-R gimble housing, gimble ring and bell housing brand new SEI outdrive. no need to worry about if it's the right replacement. i hooked the cables up and i have a problem i think i know the answer i just want to read responces first. i sat outside today...
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    trim sensor I-R gimbal housing question

    i finished putting the bellows on and for some reason when i torqued the hinged pins on i decided to check the trim sensors. i opened up the starboard side (first picture)and i noticed the white plastic piece broken i take it it's toast, then i opened the port side(second picture) and it looked...
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    bellows question

    i did a trail run on replacing all bellows i did exactly like the manual said. the manual said to put the exhaust and the shift cable bellows on the gimbal housing first and glue them (yes i used bellows adhesive) next the ujoint bellow on the bell housing first and glue it i also put the water...
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    trying first start up on rebuilt 470

    some might know i rebuilt a 470 (please no 470 hater comments) i dropped it back in the boat today. it will be first tested out on muffs. the manual said to retorque the head after start up but it didn't say how long after start up unless i missed something. so all you 470 lovers out there LOL...
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    1983 Thunder craft Flamingo Royale speedometer vaccum question

    Sorry moderators don't know if non repair question or not i had to replace the vaccumm hose it was rotted had many cracks and it was not hanging out the stern like it should , the speedometer does work i bench tested it. my question is how much is suppose to hang out of the stern, there is some...
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    Where to properly install a fuel/water separator

    my boat has the gas tank at the bow of the boat, the fuel line runs down the starboard side down to merc 470. i tried to look for info couldn't find it tried to ask locals but i couldn't get straight answer. where is the best place to put a separator on my style of boat, some people where saying...
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    Trying to learn size of prop and upgrades

    1983 Thundercraft Flamingo 470 merc 170hp it came with a I-R outdrive but i have replaced the I-R with a SE106 i think it's a alpha one i would have to dig out receipt to make sure but i'm sure it is. the prop size on the boat is what i'm trying to learn, i know the pitch is 21 because it's...
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    Battery isolation switch for dual set up

    i bought a isolation switch for my boat i want to run one battery for everything except starter as i want it to have it's own battery so i want a dual system. the isolator came with no instruction i bough it from a garage sale the guy said he bought it to dual up his boat end up selling the boat...
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    1983 470 merc 170hp prop question

    i have been looking for a new prop for my boat, i need to repair my old one but i would like to use it as a back up. i have found alot of 3 blade ones just like the one that's on the boat now but i also found some 4 blade ones that will fit can i use a 4 blade prop on this style of boat
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    i can't find prop forum where do i look

    Sorry moderaters last week i asked a prop question and you guys moved me to a prop forum for the life of me today i can't find it where do i go THANKS!!!
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    results from a smoke test on my 470

    i used a smoke tester to check for leaks in the oil chambers of the motor. there was a leak from the intake manifold gasket to the side of the head i repaired that, alls good but one thing when i was pressurizing the motor with smoke it started to come out the exhaust and the carb hole(where the...
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    1983 470 merc 170hp prop question

    i only have one prop i want to buy another used one or new one for back up what do the numbers on my prop tell me what it is here are the numbers on prop 48 78122 A40 21P. when i look up props they don't have the same numbers to campare to. i'm assuming the 21P means pitch what do the other...
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    ready to install new outdrive question

    Hi guys snowmobile projects put away now boat projects start again. i bought a new outdrive for my 1983 470 merc. i'm replacing a I-R version with a SE106. My question is when i removed the old out drive and separated the top and bottom end the two surfaces from both ends that are press against...
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    parts needed for two battery set up for 470

    I did the alternator conversion already. right now i have a 74 amp alt. i want to convert to a two battery system, i want one battery to run every thing like normal but i want the other to run the radio and bilige pump i know i have to wire the radio and bilige pump to run off one battery only...
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